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    Импульсные автоматизированные измерения скоростей упругих волн в кристаллах / П. П. Турчин [и др.] // Ползуновский вест. - 2011. - № 3/1. - С. 143-147. - Библиогр.: 17 назв. - Работа выполнена при финансовой поддержке РФФИ (проект N 09-02-98001-Сибирь) и гранта Президента РФ для поддержки ведущих научных школ РФ (НШ-4645.2010.2) . - ISSN 2072-8921
   Перевод заглавия: The pulse automated measurings of elastic waves velocities in monocrystals
Кл.слова (ненормированные):
echo-pulse method -- automated measurings -- elasticity -- monocrystals
Аннотация: На основе эхо-импульсного метода разработана автоматизированная экспериментальная установка для измерения скоростей упругих волн в кристаллах. Определены скорости акустических волн в пьезо- электрике La3Ga5SiO14 и сегнетоэластиках KPb2Br5 и RbPb2Br5
On basis of echo-pulsing method the automated experimental facility is developed for measurings of elastic waves velocities in crystals. The given method spots acoustic waves velocities in piezoelectric La3Ga5SiO14 and ferroelastics KPb2Br5 and RbPb2Br5.

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Держатели документа:
Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Турчин, Павел Петрович; Turchin P.P.; Парфенов, Аркадий Анатольевич; Токарев, Н. А.; Нестеров, А. Е.; Тарасова, Александра Юрьевна; Александров, Кирилл Сергеевич; Aleksandrov, K. S.; Алтайский государственный технический университет им. И.И. Ползунова
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Val'kov, V. V.
The magnetoelastic mechanism of singlet phase formation in a two-dimensional quantum antiferromagnet / V. V. Val'kov, V. A. Mitskan, G. A. Petrakovskii // J. Exp. Theor. Phys. - 2006. - Vol. 102, Is. 2. - P. 234-247, DOI 10.1134/S106377610602004X. - Cited References: 18 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
GROUND-STATE
   SPIN
   TRANSITION
   CUGEO3
   MODEL
Кл.слова (ненормированные):
Crystal lattices -- Elasticity -- Mathematical models -- Oscillations -- Phase diagrams -- Phase transitions -- Quantum theory -- Two dimensional -- Atomic representation -- Magnetoelastic mechanism -- Quantum antiferromagnets -- Singlet phase formation -- Antiferromagnetic materials
Аннотация: A model describing the second-order phase transition with respect to the magnetoelastic coupling parameter from the anti ferromagnetic (AFM) to the singlet state in a two-dimensional quantum magnet on a square lattice is proposed. The spectrum of elementary excitations in the singlet and AFM phases is calculated using an atomic representation, and the evolution of transverse and longitudinal branches of this spectrum is studied in the vicinity of the transition point. It is established that the AFM to singlet phase transition is related to softening of the longitudinal branch of oscillations. In the singlet phase, the gap plays the role of a parameter characterizing the distance to the phase transition point. It is shown that the spectrum of transverse oscillations in the AFM phase corresponds to the Goldstone boson. Based on an analysis of the stability of the spectrum of elementary excitations, a phase diagram is constructed that determines the regions of the existence of phases with plaquette-deformed lattices.

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Держатели документа:
Russian Acad Sci, Siberian Div, Inst Phys, Krasnoyarsk 660036, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660074, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660075, Russia
ИФ СО РАН
Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Krasnoyarsk State Technical University, Krasnoyarsk, 660074, Russian Federation
Krasnoyarsk State University, Krasnoyarsk, 660075, Russian Federation

Доп.точки доступа:
Mitskan, V. A.; Мицкан, Виталий Александрович; Petrakovskii, G. A.; Петраковский, Герман Антонович; Вальков, Валерий Владимирович
}
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    Theoretical study of elastic properties of SiC nanowires of different shapes / P. B. Sorokin [et al.] // J. Nanosci. Nanotechnol. - 2010. - Vol. 10, Is. 8. - P. 4992-4997, DOI 10.1166/jnn.2010.2424. - Cited Reference Count: 49. - Гранты: This work was partially supported by JSPS-RFBR collaborative grant 09-02-92107. The electronic structure calculations have been performed on the Joint Supercomputer Centre of the Russian Academy of Sciences. One of the authors (Pavel V. Avramov) acknowledges the encouragement of Professor K. Morokuma, research leader of Fukui Institute, Kyoto University and Dr. Alister Page for kind help and support. The geometry of all structures was visualized by ChemCraft software.SUP53/SUP. - Финансирующая организация: JSPS-RFBR [09-02-92107]; Fukui Institute, Kyoto University . - ISSN 1533-4880. - ISSN 1533-4899
Рубрики:
INITIO MOLECULAR-DYNAMICS
   SILICON-CARBIDE
   THERMAL-STABILITY
   CARBON NANOTUBES
   NANORODS
   GROWTH
   SURFACES
   NANOCRYSTALS
   POTENTIALS
   CONSTANTS
Кл.слова (ненормированные):
Silicon Carbide -- Nanowires -- Elastic Properties -- DFT -- Molecular Mechanics -- DFT -- Elastic properties -- Molecular mechanics -- Nanowires -- Silicon carbide -- Atomic structure -- Cubic phasis -- DFT -- Effective size -- Elastic properties -- SiC nanowire -- Silicon carbide nanowires -- Theoretical study -- Wire geometries -- Young's Modulus -- Crystal atomic structure -- Density functional theory -- Elastic moduli -- Elasticity -- Molecular mechanics -- Nanowires -- Wire -- Silicon carbide
Аннотация: The atomic structure and elastic properties of silicon carbide nanowires of different shapes and effective sizes were studied using density functional theory and classical molecular mechanics. Upon surface relaxation, surface reconstruction led to the splitting of the wire geometry, forming both hexagonal (surface) and cubic phases (bulk). The behavior of the pristine SiC wires under compression and stretching was studied and Young's moduli were obtained. For Y-shaped SiC nanowires the effective Young's moduli and behavior in inelastic regime were elucidated.

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Держатели документа:
Siberian Fed Univ, Krasnoyarsk 660041, Russia
Russian Acad Sci, Emanuel Inst Biochem Phys, Moscow 119334, Russia
Russian Acad Sci, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Sorokin, P.B.; Kvashnin, D.G.; Kvashnin, A.G.; Avramov, P. V.; Аврамов, Павел Вениаминович; Chernozatonskii, L.A.
}
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    Theoretical Study of Atomic Structure and Elastic Properties of Branched Silicon Nanowires / P. B. Sorokin [et al.] // ACS Nano. - 2010. - Vol. 4, Is. 5. - P. 2784-2790, DOI 10.1021/nn9018027. - Cited Reference Count: 28. - Гранты: P.B.S. acknowledges partial support by the National Science Foundation grant CMMI-0708096, NIRT. L.A.C. was supported by the Russian Academy of Sciences, program No. 21. P.V.A. and P.B.S. also acknowledge the collaborative RFBR-JSPS Grant No. 09-02-92107-Phi. All calculations have been performed on the Joint Supercomputer Center of the Russian Academy of Sciences. The geometry of all presented structures was visualized by ChemCraft software. - Финансирующая организация: National Science Foundation [CMMI-0708096]; NIRT; Russian Academy of Sciences [21]; RFBR-JSPS [09-02-92107-Phi] . - MAY. - ISSN 1936-0851
Рубрики:
ELECTRONIC-PROPERTIES
   BUILDING-BLOCKS
   NANOCRYSTALS
Кл.слова (ненормированные):
silicon nanowires -- elastic properties -- molecular mechanics -- Tersoff potential -- Elastic properties -- Molecular mechanics -- Silicon nanowires -- Tersoff potential -- Atomic structure -- Branch length -- Elastic properties -- Interatomic potential -- Silicon Nanowires -- Tersoff potential -- Theoretical study -- Young modulus -- Carbon nanotubes -- Elasticity -- Molecular mechanics -- Nanowires -- Stiffness -- Crystal atomic structure -- nanowire -- silicon -- article -- chemical structure -- chemistry -- conformation -- elasticity -- mechanical stress -- Young modulus -- Elastic Modulus -- Elasticity -- Models, Molecular -- Molecular Conformation -- Nanowires -- Silicon -- Stress, Mechanical
Аннотация: The atomic structure and elastic properties of Y-shaped silicon nanowires of "fork"- and "bough"-types were theoretically studied, and effective Young moduli were calculated using Tersoff interatomic potential. The oscillation of fork Y-type branched nanowires with various branch lengths and diameters was studied. In the final stages of the bending, the formation of new bonds between different parts of the wires was observed. It was found that the stiffness of the nanowires is comparable with the stiffness of Y-shaped carbon nanotubes.

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Держатели документа:
Russian Acad Sci, Emanuel Inst Biochem Phys, Moscow 119334, Russia
Russian Acad Sci, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia

Доп.точки доступа:
Sorokin, P.B.; Kvashnin, A.G.; Kvashnin, D.G.; Filicheva, J.A.; Avramov, P. V.; Аврамов, Павел Вениаминович; Chernozatonskii, L.A.; Fedorov, A. S.; Федоров, Александр Семенович
}
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The examination of frequency dependences of elastic waves velocities and their attenuation in heterogeneous mediums / P. P. Turchin [et al.] // Proceedings - IEEE Ultrasonics Symposium. - 2007. - Ст. 4409985. - P. 1637-1640, DOI 10.1109/ULTSYM.2007.412 . - ISBN 1051. - ISBN 1424413834; 9781424413836
Кл.слова (ненормированные):
Automation of measurings -- Ceramics -- Composites -- Elastic properties -- Physical acoustics -- Sound signal attenuation -- Elastic waves -- Elasticity -- Waves -- Automation of measurings -- Ceramics -- Composites -- Elastic properties -- Frequency dependences -- Frequency ranging -- Physical acoustics -- Sound signal attenuation -- Ultrasonics
Аннотация: The pulse - phase method for examination of ultrasonic waves propagation in materials, including mediums with high attenuation of a sound was designed. By automation methods of measurings the opportunity of determination the elastic waves velocities with an frequency range 100 kHz - 30 MHz with the resolution on frequency of 10-6 Hz is implemented. The phase method and a method of the frequency strobing for recording impulses are realized. These methods allow to define with precision not worse than 10-9 second the time of ultrasonic waves propagation. Requirements to the minimum linear dimensions of samples are restricted by the method sensitivity only. Velocities of elastic waves and their signal attenuation in ceramic and composites are measured. В© 2007 IEEE.

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Доп.точки доступа:
Turchin, P. P.; Parfenov, A. A.; Beletsky Jun, V. V.; Volzhentcev, A. A.; Ruzanov, V. M.; Aleksandrov, K. S.; Александров, Кирилл Сергеевич; IEEE International Ultrasonics symposium(2007 ; Oct. ; 28-31 ; New York, USA)
}
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Temperature dependent elastic repulsion of colloidal nanoparticles with a polymer adsorption layer / A. P. Gavrilyuk [et al.] // Colloid Polym. Sci. - 2018. - Vol. 296, Is. 10. - P. 1689-1697, DOI 10.1007/s00396-018-4383-y. - Cited References: 49. - The reported research was funded by the Russian Foundation for Basic Research, the government of the Krasnoyarsk territory and Krasnoyarsk Regional Fund of Science, grant 18-42-243023, the RF Ministry of Science and Education, the State contract with Siberian Federal University for scientific research in 2017-2019, and SB RAS Program No II.2P (0358-2015-0010). . - ISSN 0303-402X. - ISSN 1435-1536

РУБ Chemistry, Physical + Polymer Science
Рубрики:
STERICALLY-STABILIZED PARTICLES
DEPLETION FLOCCULATION
AGGREGATION
Кл.слова (ненормированные):
Nanoparticle -- Adsorption layer -- Elastic deformation -- Coagulation -- kinetics -- Elasticity modulus
Аннотация: The model of pairwise elastic repulsion of contacting colloidal nanoparticles with a rigid core and deformable shell is discussed. A simple analytical equation is applied for the energy of elastic repulsion of nanoparticles with arbitrary sizes and the elasticity moduli of self-healing polymer adsorption layers. The model is based on the representation of the absorption layer as a continuous medium that is elastically deformed upon the contact of nanoparticles. The major characteristic of this medium is the elasticity modulus. The magnitude of the elasticity modulus is determined from the condition of balance of the van der Waals attractive forces of nanoparticles and the elastic repulsion of their adsorption layers in the contact area, taking into account the temperature variations. We employed the kinetic approach to describe the dependence of the elasticity modulus on both the temperature and the rate of its change.

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Держатели документа:
RAS, SB, Inst Computat Modeling, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Inst Math & Comp Sci, Krasnoyarsk 660041, Russia.
Siberian Fed Univ, Lab Nanotechnol Spect & Quantum Chem, Krasnoyarsk 660041, Russia.
RAS, SB, Fed Res Ctr KSC, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian State Univ Sci & Technol, Krasnoyarsk 660014, Russia.

Доп.точки доступа:
Gavrilyuk, A. P.; Gerasimov, V. S.; Герасимов, Валерий Сергеевич; Ershov, A. E.; Ершов, Александр Евгеньевич; Karpov, S. V.; Карпов, Сергей Васильевич; Russian Foundation for Basic Research; government of the Krasnoyarsk territory and Krasnoyarsk Regional Fund of Science [18-42-243023]; RF Ministry of Science and Education,; State contract with Siberian Federal University for scientific research in 2017-2019; SB RAS Program [II.2P (0358-2015-0010)]
}
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Sorokin, B. P.
Influence of heterogeneous external fields on propagation of bulk acoustic waves in crystals / B. P. Sorokin, A. N. Marushyak, K. S. Aleksandrov // Proceedings - IEEE Ultrasonics Symposium. - 2008. - Ст. 4803313. - P. 1472-1475, DOI 10.1109/ULTSYM.2008.0358 . - ISBN 1051-0117
Кл.слова (ненормированные):
Bulk elastic wave -- Non-homogeneous mechanical loading -- Phase velocity -- Wave surface -- Bulk acoustic waves -- Bulk elastic wave -- Bulk waves -- External fields -- Non-homogeneous -- Non-homogeneous mechanical loading -- Numerical calculation -- Small amplitude -- Wave surface -- Acoustic fields -- Crystals -- Elastic waves -- Elasticity -- Phase velocity -- Silicon compounds -- Soil structure interactions -- Waves -- Velocity
Аннотация: Formulas describing the influence of nonhomogeneous pressure on propagation of bulk waves in crystals have derived. Phase velocity for small amplitude waves in Bi12SiO20 crystal the action of non-homogeneous pressure has been . Under those conditions the behavior of the wave has researched. Numerical calculation of phase velocity of and their directions propagation changing have obtained. В©2008 IEEE.

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Доп.точки доступа:
Marushyak, A. N.; Aleksandrov, K. S.; Александров, Кирилл Сергеевич; IEEE International ultrasonics symposium(2008 ; Nov. ; 2-5 ; Beijing, China)
}
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Reflection and refraction of bulk acoustic waves in piezoelectric crystals under the action of bias electric field and uniaxial pressure / S. I. Burkov [et al.] // Proceedings - IEEE Ultrasonics Symposium. - 2008. - Ст. 4803254. - P. 2161-2164, DOI 10.1109/ULTSYM.2008.0535 . - ISBN 1051-0117
Кл.слова (ненормированные):
Bias electric field -- Bulk elastic wave -- Mechanical stress -- Piezoelectric crystal -- Reflection -- Refraction -- Bias electric field -- Bulk acoustic waves -- Bulk elastic wave -- Mechanical stress -- Piezoelectric crystal -- Piezoelectric crystals -- Uniaxial pressures -- Acoustic wave reflection -- Acoustics -- Crystals -- Elastic waves -- Elasticity -- Electric field measurement -- Electric fields -- Piezoelectric materials -- Piezoelectric transducers -- Piezoelectricity -- Refraction -- Soil structure interactions -- Stresses
Аннотация: Main theory results concerned with bulk elastic wave reflection/refraction on the boundary between two piezoelectric crystals subjected to the action of bias electric field or mechanical stress have presented. Some calculations for LiNbO3 and Bi12GeO20 crystals have made. В©2008 IEEE.

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Доп.точки доступа:
Burkov, S. I.; Sorokin, B. P.; Karpovich, A. A.; Aleksandrov, K. S.; Александров, Кирилл Сергеевич; IEEE International ultrasonics symposium(2008 ; Nov. ; 2-5 ; Beijing, China)
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Physical principles of the formation of a nanoparticle electric double layer in metal hydrosols / A. P. Gavrilyuk [et al.] // Colloid Polym. Sci. - 2020. - Vol. 298, Is. 1. - P. 1-7, DOI 10.1007/s00396-019-04573-8. - Cited References: 25. - The reported research was funded by the Russian Foundation for Basic Research and the government of the Krasnoyarsk territory, Krasnoyarsk Regional Fund of Science, grant No 18-42-243023, the RF Ministry of Education and Science, the State contract with Siberian Federal University for scientific research in 2017–2019. . - ISSN 0303-402X. - ISSN 1435-1536
Кл.слова (ненормированные):
Nanoparticle -- Adsorption layer -- Elastic deformation -- Coagulation kinetics -- Elasticity modulus
Аннотация: The Brownian dynamics method is employed to study the formation of an electrical double layer (EDL) on the metal nanoparticle (NP) surface in hydrosols during adsorption of electrolyte ions from the interparticle medium. Also studied is the charge accumulation by NPs in the Stern layer. To simulate the process of the formation of EDL, we took into account the effect of image forces and specific adsorption, dissipative and random forces, and the degree of hydration of adsorbed ions on the EDL structure. The employed model makes it possible to determine the charge of NPs and the structure of EDL. For the first time, the charge of both the diffuse part of EDL and the dense Stern layer has been determined. A decrease in the electrolyte concentration (below c ˂ 0.1 mol/l) has been found to result in dramatic changes in the formation of the Stern layer.

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Держатели документа:
Institute of Computational Modeling SB RAS, Krasnoyarsk, Russia
Siberian Federal University, Krasnoyarsk, Russia
L. V. Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russia
Siberian State University of Science and Technology, Krasnoyarsk, Russia

Доп.точки доступа:
Gavrilyuk, A. P.; Isaev, I. L.; Gerasimov, V. S.; Герасимов, Валерий Сергеевич; Karpov, S. V.; Карпов, Сергей Васильевич
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10.

Peculiarities of electromechanical properties of ferroelectric NH//4HSeO//4 / V. S. Krasikov [et al.] // Ferroelectrics. - 1983. - Vol. 54, Is. 1. - P. 431-434 . - ISSN 0015-0193
Кл.слова (ненормированные):
ELASTICITY -- PIEZOELECTRICITY -- AMMONIUM HYDROSELENATE -- ELECTROMECHANICAL PROPERTIES -- PHASE TRANSITIONS -- FERROELECTRIC MATERIALS
Аннотация: Dielectric, piezoelectric and elastic properties of NH//4HSeO//4 crystal were studied in temperature range 180-300 K. Some anomalies of the properties near T//c equals 250 K and T//i equals 261 K were found. These anomalies are caused by high dielectric permeability along b-axis above T//i and the symmetry-forbidden piezoelectric coupling. An effort of phenomenological description of the successive phase transitions is made.

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Доп.точки доступа:
Krasikov, V. S.; Zaitseva, M. P.; Shabanova, L. A.; Zrazhevsky, V. M.; Zherebtsova, L. I.; Aleksandrov, K. S.; Александров, Кирилл Сергеевич; European Meeting on Ferroelectricity(5 ; 1983 ; Sept. ; 26-30 ; Malaga, Sp)
}
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